下列（）最不可能是ABS系统出现间歇性故障的原因。A.在车轮传感器中电气接头损坏

（12分）X、Y、Z、W、N五种元素中，X原子核外的M层中只有两个成对电子，Y原子的外围电子排布式为nsⁿnpⁿ⁺¹，Z是地壳内含量（质量分数）最高的元素，W的核电荷数是X与Z的核电荷数之和，N在元素周期表的各元素中电负性最大。

（1）Z元素基态原子的电子排布图为                       

（2）W的元素符号是       ，在周期表中的位置是               ，其基态原子的电子排布式为         ，在形成化合物时它的最高化合价为              

（3）Y的氢化物的VSEPR模型是         ，属于         分子（填极性或非极性），

（4）X的氢化物的沸点     Z的氢化物的沸点（填大于、小于或等于）

原因是                                         

（5）用氢键表示式写出N的氢化物溶液中存在的所有氢键                      

农药按对人畜毒性的大小分为（）、（）和（）三个级别。

发包人逾期支付设计费( )天以上时，设计人有权暂停履行下阶段工作，并书面通知发包人。

A．14
B．15
C．28
D．30

戈兰高地

When Melissa Mahan and her husband visited the Netherlands, they felt imprisoned by their tour bus. It forced them to see the city according to a particular route and specific schedule--but going off on their own meant missing out on the information provided by the guide. On their return home to San Diego, California, they started a new company called Tour Coupes. Now, when tourists in San Diego rent one of their small, brightly coloured three-wheeled vehicles, they are treated to a narration over the stereo system about the places they pass, triggered by Global Positioning System (GPS) satellite technology.

This is just one example of how GPS is being used to provide new services to tourists. "What we really have here is a technology that allows people to forget about the technology," says Jim Carrier of IntelliTours, a GPS tourism firm which began offering a similar service over a year ago in Montgomery, Alabama. The city is packed with sites associated with two important chapters in American history, the civil war of the 1860s and the civil-rights movement a century later. Montgomery has a 120-year-old trolley system, called the Lightning Route, which circulates around the downtown area and is mainly used by tourists. On the Lightning Route trolleys, GPS-triggered audio clips point out historical hotspots.

Other firms, such as CityShow in New York and GPS Tours Canada in Banff, Canada, offer hand-held GPS receivers that play audio clips for listening to while walking or driving. In South Africa, Europcar, a car-rental firm, offers a device called the Xplorer. As well as providing commentary on 2 000 points of interest, it can also warn drivers if they exceed the local speed limit.

If such services prove popular, the use of dedicated audio-guide devices could give way to a different approach. A growing number of mobile phones have built-in GPS or can determine their locations using other technologies. Information for tourists delivered via phones could be updated in real time and could contain advertisements. "Location-based services", such as the ability to call up a list of nearby banks or pizzerias, have been talked about for years but have never taken off. But aiming such services at tourists makes sense--since people are more likely to want information when in an unfamiliar place. It could give mobile roaming a whole new meaning.

When a traveler is in an unfamiliar place, （）

A. mobile roaming will meet his needs

B. he wants to know something about it

C. Location-based services play a key role in his traveling

D. he must understand the roles of Location-based services